Php Questions

53. List out the predefined classes in PHP?
Ans:-
1. Standard Defined Classes
These classes are defined in the standard set of functions included in the PHP build.

a. Directory
The class from which dir() is instantiated.

b.stdClass

2.Ming Defined Classes
These classes are defined in the Ming extension, and will only be available when that
extension has either been compiled into PHP or dynamically loaded at runtime.

a.swfshape

b. swffill

c. swfgradient

d. swfbitmap

e. swftext

f. swftextfield

g. swffont

h. swfdisplayitem

i. swfmovie

j. swfbutton

k. swfaction

l. swfmorph

m. swfsprite

3. Oracle 8 Defined Classes
These classes are defined in the Oracle 8 extension, and will only be available when
that extension has either been compiled into PHP or dynamically loaded at runtime.

a. OCI-Lob
b. OCI-Collection

4. qtdom Defined Classes
These classes are defined in the qtdom extension, and will only be available when that
extension has either been compiled into PHP or dynamically loaded at runtime.

a. QDomDocument

b. QDomNode

56. How can we send mail using JavaScript?
Ans:-
No You can't send mail using Javascript but u can execute a client side email client to send the email using mailto: code.

Using clientside email client
function myfunction(form)
{
tdata=document.myform.tbox1.value;
location="mailto:mailid@domain.com?subject="+tdata+"/MYFORM";
return true;
}

This question is wrong. You aren’t really ’sending mail’ when doing a ‘mailto’ and so it’s a misleading question… A smart candidate would just say “It’s not possible” and you may write him off.

57. What is meant by PEAR in php?
Ans:-
PEAR is the next revolution in PHP. This repository is bringing higher level programming to PHP. PEAR is a framework and distribution system for reusable PHP components. It eases installation by bringing an automated wizard, and packing the strength and experience of PHP users into a nicely organised OOP library. PEAR also provides a command-line interface that can be used to automatically install "packages"

58. What is the purpose of the following files having extensions 1) frm 2) MYD 3) MYI. What these files contains?
Ans:-
In MySql, the default table type is MyISAM.
Each MyISAM table is stored on disk in three files. The files have names that begin with the table name and have an extension to indicate the file type.
The `.frm' file stores the table definition.
The data file has a `.MYD' (MYData) extension.
The index file has a `.MYI' (MYIndex) extension,

59.Session

Session support in PHP consists of a way to preserve certain data across subsequent accesses. This enables you to build more customized applications and increase the appeal of your web site.

60. What is the difference between echo and print statement?

echo() can take multiple expressions,Print cannot take multiple expressions.

echo has the slight performance advantage because it doesn't have a return value.